aada 0.1.0

//! 运行时聚合体 [`RT`] 与每帧引擎管线。
//!
//! 管线分五步（可用 [`RT::render_frame`] 一把梭，或分步调用以便中间操纵）：
//! [`RT::sample`]（采样动画）-> [`RT::pose_from_sample`]（构建动画后姿态，可改 pose）
//! -> [`RT::constraint_state`]（约束状态，可改）-> [`RT::apply_constraint_state`]
//! （按 order 应用 IK/transform）-> [`RT::build_payloads`]（蒙皮变形 + 渲染负载）。

use crate::{
    custom_index::AsIndex,
    data::runtime::{
        animate::{
            AnimIdx, AnimateConfig, AnimateSet, SampledAnimate, SampledAttachment,
            SampledSlotValue, SlotChannel,
        },
        constraint::{ConstraintSet, ConstraintState, apply_constraints},
        mesh::{MeshIdx, MeshSet},
        payload::{MeshPayload, PayloadUsage},
        skeleton::{Pose, Skeleton},
        skin::{AttachmentSet, SkinIdx, SkinSet},
        slot::{SlotIdx, SlotSet},
    },
};

/// 一个完整的运行时数据集合，具体使用时还是根据需求使用内部数据，这个结构体主要是为了方便管理和传递
#[derive(Debug, Clone)]
pub struct RT {
    pub skins: SkinSet,
    pub meshs: MeshSet,
    pub skeleton: Skeleton,
    pub slots: SlotSet,
    pub attachments: AttachmentSet,
    pub animates: AnimateSet,
    pub constraints: ConstraintSet,
}

impl RT {
    /// 拆分渲染管线步骤 1：采样动画（骨骼 + slot + 约束 + deform + draw order）
    pub fn sample(&self, anim: AnimIdx, config: &mut AnimateConfig, t: f32) -> SampledAnimate {
        self.animates.sample(anim, config, t)
    }

    /// 拆分渲染管线步骤 2：由采样结果构建动画后 Pose（default_pose + 应用骨骼通道）
    ///
    /// 返回后可在约束前修改 pose（如外部操纵骨骼），再走 [Self::constraint_state] + [Self::apply_constraint_state]
    pub fn pose_from_sample(&self, sampled: &SampledAnimate) -> Pose {
        let mut pose = self.skeleton.default_pose();
        sampled.apply_pose(&mut pose);
        pose
    }

    /// 拆分渲染管线步骤 3：约束状态（骨架默认值 + 动画时间轴覆盖），返回后也可修改
    pub fn constraint_state(&self, sampled: &SampledAnimate) -> ConstraintState {
        let mut state = self.constraints.new_state();
        sampled.apply_constraints(&mut state);
        state
    }

    /// 拆分渲染管线步骤 4：按 order 全局应用约束到 pose（IK / transform）
    pub fn apply_constraint_state(&self, pose: &mut Pose, state: &ConstraintState) {
        apply_constraints(pose, &self.skeleton, &self.constraints, state);
    }

    /// 拆分渲染管线步骤 5：由（约束后）pose + 采样结果生成渲染负载列表
    ///
    /// 皮肤默认 attachment 选择、slot 动画覆盖（attachment 切换 / 颜色）、蒙皮变形、绘制顺序、裁剪指令都在此完成
    pub fn build_payloads(
        &self,
        skins: &[SkinIdx],
        sampled: &SampledAnimate,
        pose: &mut Pose,
    ) -> Vec<MeshPayload> {
        // 期望 attachment：皮肤默认选择 + slot 动画覆盖（attachment 切换 / 隐藏）
        let mut wanted = self.skins.sample(skins, &self.slots, &self.attachments);
        // 动画覆盖的 slot 颜色（t < 首帧时时间轴未生效，不覆盖，用 slot 默认颜色）
        // 按 slot 索引数组（None = 未覆盖），避免每帧 HashMap 分配与 hash 查找
        let mut slot_colors: Vec<Option<[f32; 4]>> = vec![None; self.slots.data.len()];
        for (slot, channel, value) in &sampled.slot_values {
            match (channel, value) {
                (SlotChannel::Attachment, SampledSlotValue::Attachment(SampledAttachment::Set(name))) => {
                    // 动画 attachment 名是逻辑名（解析期已索引化），按 (slot, 皮肤优先级) 查找；找不到视为隐藏
                    let new_att = match name {
                        Some(name_idx) => {
                            let mut found = None;
                            for &sk in skins {
                                if let Some(att) = self.skins.data[sk].get(*slot, *name_idx) {
                                    found = Some(att);
                                    break;
                                }
                            }
                            found
                        }
                        None => None,
                    };
                    wanted.set(*slot, new_att);
                }
                // 官方语义：t < 首帧时 attachment 时间轴未生效，保持皮肤默认 attachment
                (SlotChannel::Attachment, SampledSlotValue::Attachment(SampledAttachment::NotStarted)) => {}
                (SlotChannel::Color, SampledSlotValue::Color(Some(c))) => {
                    slot_colors[slot.as_index()] = Some(*c);
                }
                _ => {}
            }
        }

        // 每个可见 slot：attachment -> 网格（普通网格或裁剪多边形）-> 蒙皮变形 -> payload
        // 裁剪区域：clip 槽到 end 槽之间（不含 end 槽）的网格全部被裁剪，嵌套取交集
        // 迭代顺序 = 绘制顺序：draw order 动画重排（官方语义：drawOrder[i] = setup 索引）
        let mut payloads = Vec::new();
        let mut clip_stack: Vec<MeshIdx> = Vec::new();
        // 一次性建立 slot -> [(deform 所属 mesh, deform 索引)]：deform 时间轴挂在具体 attachment 上，
        // 只对当前显示的网格匹配（官方 timelineAttachment 语义）；无 deform 时不分配
        let mut deform_map: Vec<Option<Vec<(MeshIdx, usize)>>> = Vec::new();
        if !sampled.deform_values.is_empty() {
            deform_map.resize(self.slots.data.len(), None);
            for (i, (s, m, _)) in sampled.deform_values.iter().enumerate() {
                deform_map[s.as_index()]
                    .get_or_insert_with(Vec::new)
                    .push((*m, i));
            }
        }
        let wanted_iter: Vec<(
            SlotIdx,
            Option<crate::data::runtime::skin::AttachmentDataIdx>,
        )> = match &sampled.draw_order {
            Some(order) => wanted.iter_with_order(order),
            None => wanted.iter().collect(),
        };
        for (slot, attachment) in wanted_iter {
            // 到达 end 槽：先弹出到达终点的裁剪区域（可能多个同时结束）
            while let Some(&clip_mesh) = clip_stack.last() {
                let end = self.meshs.data_map[clip_mesh].clip_end_slot.unwrap();
                if slot.as_index() >= end.as_index() {
                    clip_stack.pop();
                    payloads.push(MeshPayload::new(
                        PayloadUsage::ClipEnd { id: clip_mesh },
                        slot,
                        Vec::new(),
                        Vec::new(),
                        Vec::new(),
                        [1.0, 1.0, 1.0, 1.0],
                        glam::Affine2::IDENTITY,
                    ));
                } else {
                    break;
                }
            }
            let Some(attachment) = attachment else {
                continue;
            };
            let slot_bone = self.slots.get_bone(slot);
            let Some(mesh_idx) = self.attachments.get_mesh(attachment) else {
                continue;
            };
            let mesh_data = &self.meshs.data_map[mesh_idx];
            // deform：动画采样值（加权 = 按 influence 的 delta、非加权 = 绝对位置），
            // 按 (slot, 网格) 匹配（只取当前显示的 attachment 的 deform）
            let deform = deform_map
                .get(slot.as_index())
                .and_then(|v| v.as_ref())
                .and_then(|list| list.iter().find(|(m, _)| *m == mesh_idx))
                .map(|&(_, i)| sampled.deform_values[i].2.as_slice());
            let positions = match deform {
                Some(d) => mesh_data.deform_with_deform(d, pose, &self.skeleton, slot_bone),
                None => mesh_data.deform(pose, &self.skeleton, slot_bone),
            };
            if let Some(_end_slot) = mesh_data.clip_end_slot {
                // 裁剪多边形：输出变形后的顶点，进入裁剪区域
                payloads.push(MeshPayload::new(
                    PayloadUsage::ClipStart { id: mesh_idx },
                    slot,
                    positions,
                    Vec::new(),
                    Vec::new(),
                    [1.0, 1.0, 1.0, 1.0],
                    glam::Affine2::IDENTITY,
                ));
                clip_stack.push(mesh_idx);
            } else {
                // tint = slot 有效颜色（动画覆盖或 slot 默认色）× attachment 默认颜色（乘性）
                let slot_color = slot_colors[slot.as_index()]
                    .unwrap_or(self.slots.data[slot].color);
                let att_color = self.attachments.data[attachment].color;
                let tint = [
                    slot_color[0] * att_color[0],
                    slot_color[1] * att_color[1],
                    slot_color[2] * att_color[2],
                    slot_color[3] * att_color[3],
                ];
                payloads.push(MeshPayload::new(
                    PayloadUsage::Mesh(mesh_idx),
                    slot,
                    positions,
                    mesh_data
                        .uvs
                        .chunks_exact(2)
                        .map(|c| glam::Vec2::new(c[0], c[1]))
                        .collect(),
                    mesh_data.triangles.iter().map(|&i| i as u32).collect(),
                    tint,
                    glam::Affine2::IDENTITY,
                ));
            }
        }
        // 动画结束时栈里不应残留未关闭的裁剪区域（end 槽缺失时兜底弹出）
        while let Some(clip_mesh) = clip_stack.pop() {
            payloads.push(MeshPayload::new(
                PayloadUsage::ClipEnd { id: clip_mesh },
                unsafe { SlotIdx::from_index(0) },
                Vec::new(),
                Vec::new(),
                Vec::new(),
                [1.0, 1.0, 1.0, 1.0],
                glam::Affine2::IDENTITY,
            ));
        }
        payloads
    }

    /// 每帧渲染接口：采样动画（骨骼 + slot）并生成渲染负载列表
    ///
    /// 输入：皮肤优先级列表（靠前的优先）、动画索引、动画采样器状态（跨帧复用，用于连续采样加速）、时间 t
    /// 输出：MeshPayload 列表，每个 payload 对应一个当前可见的有效网格，列表顺序即渲染顺序
    /// （slot 动画的 attachment 切换与颜色动画已在此应用，渲染层只需消费 payload）
    ///
    /// 需要修改中间结果的调用方（如外部操纵骨骼、覆盖约束参数）请改用拆分步骤：
    /// [RT::sample] -> [RT::pose_from_sample]（可修改 pose）-> [RT::constraint_state]（可修改约束状态）
    /// -> [RT::apply_constraint_state] -> [RT::build_payloads]
    pub fn render_frame(
        &self,
        skins: &[SkinIdx],
        anim: AnimIdx,
        config: &mut AnimateConfig,
        t: f32,
    ) -> Vec<MeshPayload> {
        let sampled = self.sample(anim, config, t);
        let mut pose = self.pose_from_sample(&sampled);
        let state = self.constraint_state(&sampled);
        self.apply_constraint_state(&mut pose, &state);
        self.build_payloads(skins, &sampled, &mut pose)
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::{
        custom_index::AsIndex,
        data::runtime::{
            animate::{AnimateSet, AnimationRT, Curve, DeformFrame, DeformTimeline, Keyframe, SlotKeyframe, SlotTimeline, Timeline},
            mesh::{MeshData, MeshIdx, MeshMetadata},
            skeleton::{BoneIdx, Skeleton},
            skin::{AttachmentData, AttachmentNames, Skin},
            slot::{SlotData, SlotIdx},
        },
        utils::default,
    };

    /// 最小 RT：1 骨骼 / 1 slot（默认 attachment "a"）/ 2 网格 / 1 皮肤 / 1 动画
    fn build_rt() -> (RT, SkinIdx, AnimIdx) {
        let mut skeleton = Skeleton::new();
        skeleton.insert_bone("root", default()).unwrap();

        // 附件逻辑名 intern 表（1 个 slot）
        let mut names = AttachmentNames::new(1);
        let mut slots = SlotSet::new();
        let slot_idx = slots.insert(
            "s",
            SlotData {
                name: "s".to_string(),
                bone: unsafe { BoneIdx::from_index(0) },
                default_attachment: Some("a".to_string()),
                default_attachment_idx: Some(names.intern(
                    unsafe { SlotIdx::from_index(0) },
                    "a",
                )),
                color: [1.0, 1.0, 1.0, 1.0],
            },
        );
        let _ = slot_idx;

        let mut meshs = MeshSet::new();
        let make_mesh = || MeshData {
            meta: MeshMetadata::default(),
            texture_name: "t".to_string(),
            uvs: vec![0.0, 0.0],
            vertex_count: 1,
            triangles: vec![],
            bones: None,
            // 单顶点受 1 个骨骼影响（无 bones 时取 slot 主骨骼），局部坐标在原点
            influence_counts: vec![1],
            vertices_locals: vec![0.0, 0.0],
            influence_bone_indices: vec![0],
            influence_weights: vec![1.0],
            clip_end_slot: None,
        };
        let mesh_a = meshs.insert_mesh("s_a".to_string(), make_mesh());
        let mesh_b = meshs.insert_mesh("s_b".to_string(), make_mesh());

        let mut attachments = AttachmentSet::new();
        let att_a = attachments.insert(
            "skin_a".to_string(),
            AttachmentData {
                name: "skin_a".to_string(),
                mesh: Some(mesh_a),
                color: [1.0, 1.0, 1.0, 1.0],
            },
        );
        let att_b = attachments.insert(
            "skin_b".to_string(),
            AttachmentData {
                name: "skin_b".to_string(),
                mesh: Some(mesh_b),
                color: [1.0, 1.0, 1.0, 1.0],
            },
        );
        let mut skin = Skin::new();
        skin.insert(slot_idx, names.intern(slot_idx, "a"), att_a);
        skin.insert(slot_idx, names.intern(slot_idx, "b"), att_b);
        let mut skins = SkinSet::new();
        let skin_idx = skins.insert("skin", skin);

        // 动画：骨骼平移 + slot attachment 在 t=0.5 切换到 "b"
        let mut animates = AnimateSet::new();
        let anim_idx = animates.insert(
            "walk",
            AnimationRT {
                name: "walk".to_string(),
                constraint_timelines: vec![],
                deform_timelines: vec![],
                draw_order_timeline: None,
                duration: 1.0,
                timelines: vec![Timeline {
                    bone: unsafe { BoneIdx::from_index(0) },
                    channel: crate::data::runtime::animate::BoneChannel::TranslateX,
                    frames: vec![
                        Keyframe {
                            time: 0.0,
                            value: 0.0,
                            curve: Curve::Linear,
                        },
                        Keyframe {
                            time: 1.0,
                            value: 10.0,
                            curve: Curve::Linear,
                        },
                    ],
                }],
                slot_timelines: vec![SlotTimeline {
                    slot: unsafe { SlotIdx::from_index(0) },
                    channel: SlotChannel::Attachment,
                    frames: vec![
                        SlotKeyframe::Attachment {
                            time: 0.0,
                            name: Some(names.intern(slot_idx, "a")),
                        },
                        SlotKeyframe::Attachment {
                            time: 0.5,
                            name: Some(names.intern(slot_idx, "b")),
                        },
                    ],
                }],
            },
        );

        let rt = RT {
            skins,
            meshs,
            skeleton,
            slots,
            attachments,
            animates,
            constraints: ConstraintSet::default(),
        };
        (rt, skin_idx, anim_idx)
    }

    #[test]
    fn render_frame_delivers_payload_list() {
        let (rt, skin_idx, anim_idx) = build_rt();
        let mut config = AnimateConfig::new();

        // t=0：皮肤默认 attachment "a"（动画也是 "a"）-> mesh_a
        let payloads = rt.render_frame(&[skin_idx], anim_idx, &mut config, 0.0);
        assert_eq!(payloads.len(), 1);
        assert_eq!(
            payloads[0].usage,
            PayloadUsage::Mesh(unsafe { MeshIdx::from_index(0) })
        );
        assert_eq!(payloads[0].tint_color, [1.0, 1.0, 1.0, 1.0]);

        // t=0.5：动画 attachment 切换到 "b" -> mesh_b（skin 里逻辑名 "b" 生效）
        let payloads = rt.render_frame(&[skin_idx], anim_idx, &mut config, 0.5);
        assert_eq!(payloads.len(), 1);
        assert_eq!(
            payloads[0].usage,
            PayloadUsage::Mesh(unsafe { MeshIdx::from_index(1) })
        );

        // t=0.5 时骨骼平移插值到 5.0（deform 顶点位置）
        assert!(
            (payloads[0].positions[0].x - 5.0).abs() < 1e-5,
            "x={}",
            payloads[0].positions[0].x
        );
    }

    #[test]
    fn render_frame_slot_color_tint() {
        let (rt, skin_idx, anim_idx) = build_rt();
        let mut config = AnimateConfig::new();
        let payloads = rt.render_frame(&[skin_idx], anim_idx, &mut config, 0.0);
        assert_eq!(payloads.len(), 1);
        // 无颜色动画、默认白 slot/attachment 时 tint 为白色
        assert_eq!(payloads[0].tint_color, [1.0, 1.0, 1.0, 1.0]);
        // 列表顺序即渲染顺序（靠后覆盖靠前）
        assert_eq!(payloads[0].slot.as_index(), 0);
    }

    /// tint 语义（spine 官方）：最终 tint = slot 有效颜色 × attachment 颜色，两者乘性继承。
    /// slot 有效颜色 = slot 默认色，被动画 color 时间轴覆盖（t >= 首帧）
    #[test]
    fn render_frame_tint_slot_default_times_attachment() {
        use crate::data::runtime::animate::{Curve, SlotKeyframe, SlotTimeline};
        let (mut rt, skin_idx, anim_idx) = build_rt();
        let slot_idx = unsafe { SlotIdx::from_index(0) };
        // slot 默认色 (1, 0.5, 0, 1) × attachment 色 (0.5, 1, 0.5, 0.8)
        rt.slots.data[slot_idx].color = [1.0, 0.5, 0.0, 1.0];
        let mut names = AttachmentNames::new(rt.slots.data.len());
        let att_a = rt.skins.data[skin_idx]
            .get(slot_idx, names.intern(slot_idx, "a"))
            .unwrap();
        rt.attachments.data[att_a].color = [0.5, 1.0, 0.5, 0.8];
        // attachment b 保持白色
        let att_b = rt.skins.data[skin_idx]
            .get(slot_idx, names.intern(slot_idx, "b"))
            .unwrap();
        let _ = att_b;

        // 动画 color 时间轴首帧在 t=0.25：t<0.25 未生效（用 slot 默认色），t>=0.25 覆盖
        // （注意 t=0.5 动画会把 attachment 切到 "b"，与颜色语义无关，避让）
        rt.animates.slot_timelines_mut(anim_idx).push(SlotTimeline {
            slot: slot_idx,
            channel: crate::data::runtime::animate::SlotChannel::Color,
            frames: vec![SlotKeyframe::Color {
                time: 0.25,
                rgba: [0.0, 1.0, 0.0, 1.0],
                curves: [
                    Curve::Linear,
                    Curve::Linear,
                    Curve::Linear,
                    Curve::Linear,
                ],
            }],
        });

        let mut config = AnimateConfig::new();
        // t=0：时间轴未生效 -> slot 默认色 × attachment 色 = (0.5, 0.5, 0, 0.8)
        let payloads = rt.render_frame(&[skin_idx], anim_idx, &mut config, 0.0);
        assert_eq!(payloads[0].tint_color, [0.5, 0.5, 0.0, 0.8]);
        // t=0.25：动画覆盖 slot -> (0,1,0,1) × attachment 色 = (0, 1, 0, 0.8)
        let payloads = rt.render_frame(&[skin_idx], anim_idx, &mut config, 0.25);
        assert_eq!(payloads[0].tint_color, [0.0, 1.0, 0.0, 0.8]);
        // t=0.5：attachment 切到 "b"（白色）-> 动画色 × 白 = (0,1,0,1)
        let payloads = rt.render_frame(&[skin_idx], anim_idx, &mut config, 0.5);
        assert_eq!(payloads[0].tint_color, [0.0, 1.0, 0.0, 1.0]);
    }

    /// clip 场景：clip 槽 -> 被裁剪的网格槽 -> end 槽，payload 流应输出 ClipStart/Mesh/ClipEnd
    /// （clip 是 MeshData 的变体：clip_end_slot 非空、无 UV/三角形）
    #[test]
    fn render_frame_clip_stack() {
        let mut skeleton = Skeleton::new();
        skeleton.insert_bone("root", default()).unwrap();

        // 附件逻辑名 intern 表（3 个 slot）
        let mut names = AttachmentNames::new(3);
        let mut slots = SlotSet::new();
        slots.insert(
            "clip",
            SlotData {
                name: "clip".to_string(),
                bone: unsafe { BoneIdx::from_index(0) },
                default_attachment: Some("c".to_string()),
                default_attachment_idx: Some(names.intern(
                    unsafe { SlotIdx::from_index(0) },
                    "c",
                )),
                color: [1.0, 1.0, 1.0, 1.0],
            },
        );
        slots.insert(
            "mid",
            SlotData {
                name: "mid".to_string(),
                bone: unsafe { BoneIdx::from_index(0) },
                default_attachment: Some("m".to_string()),
                default_attachment_idx: Some(names.intern(
                    unsafe { SlotIdx::from_index(1) },
                    "m",
                )),
                color: [1.0, 1.0, 1.0, 1.0],
            },
        );
        let slot_end = slots.insert(
            "end",
            SlotData {
                name: "end".to_string(),
                bone: unsafe { BoneIdx::from_index(0) },
                default_attachment: Some("e".to_string()),
                default_attachment_idx: Some(names.intern(
                    unsafe { SlotIdx::from_index(2) },
                    "e",
                )),
                color: [1.0, 1.0, 1.0, 1.0],
            },
        );

        let mut meshs = MeshSet::new();
        let make_mesh = || MeshData {
            meta: MeshMetadata::default(),
            texture_name: "t".to_string(),
            uvs: vec![0.0, 0.0],
            vertex_count: 1,
            triangles: vec![],
            bones: None,
            influence_counts: vec![1],
            vertices_locals: vec![0.0, 0.0],
            influence_bone_indices: vec![0],
            influence_weights: vec![1.0],
            clip_end_slot: None,
        };
        // 裁剪多边形也是网格条目（clip_end_slot 标记），id 即 mesh_idx
        let mesh_clip = meshs.insert_mesh(
            "clip_c".to_string(),
            MeshData {
                meta: MeshMetadata::default(),
                texture_name: "c".to_string(),
                uvs: vec![],
                vertex_count: 3,
                triangles: vec![],
                bones: None,
                influence_counts: vec![1, 1, 1],
                vertices_locals: vec![0.0, 0.0, 1.0, 0.0, 1.0, 1.0],
                influence_bone_indices: vec![0, 0, 0],
                influence_weights: vec![1.0, 1.0, 1.0],
                clip_end_slot: Some(slot_end),
            },
        );
        let mesh_mid = meshs.insert_mesh("mid_m".to_string(), make_mesh());
        let mesh_end = meshs.insert_mesh("end_e".to_string(), make_mesh());

        let mut attachments = AttachmentSet::new();
        let att_c = attachments.insert(
            "skin_c".to_string(),
            AttachmentData {
                name: "skin_c".to_string(),
                mesh: Some(mesh_clip),
                color: [1.0, 1.0, 1.0, 1.0],
            },
        );
        let att_m = attachments.insert(
            "skin_m".to_string(),
            AttachmentData {
                name: "skin_m".to_string(),
                mesh: Some(mesh_mid),
                color: [1.0, 1.0, 1.0, 1.0],
            },
        );
        let att_e = attachments.insert(
            "skin_e".to_string(),
            AttachmentData {
                name: "skin_e".to_string(),
                mesh: Some(mesh_end),
                color: [1.0, 1.0, 1.0, 1.0],
            },
        );
        let mut skin = Skin::new();
        skin.insert(
            unsafe { SlotIdx::from_index(0) },
            names.intern(unsafe { SlotIdx::from_index(0) }, "c"),
            att_c,
        );
        skin.insert(
            unsafe { SlotIdx::from_index(1) },
            names.intern(unsafe { SlotIdx::from_index(1) }, "m"),
            att_m,
        );
        skin.insert(
            slot_end,
            names.intern(slot_end, "e"),
            att_e,
        );
        let mut skins = SkinSet::new();
        let skin_idx = skins.insert("skin", skin);

        let mut animates = AnimateSet::new();
        let anim_idx = animates.insert(
            "idle",
            AnimationRT {
                name: "idle".to_string(),
                constraint_timelines: vec![],
                deform_timelines: vec![],
                draw_order_timeline: None,
                duration: 1.0,
                timelines: vec![],
                slot_timelines: vec![],
            },
        );

        let rt = RT {
            skins,
            meshs,
            skeleton,
            slots,
            attachments,
            animates,
            constraints: ConstraintSet::default(),
        };
        let mut config = AnimateConfig::new();
        let payloads = rt.render_frame(&[skin_idx], anim_idx, &mut config, 0.0);

        // 期望流：ClipStart(clip) -> Mesh(mid) -> ClipEnd(clip) -> Mesh(end)
        assert_eq!(payloads.len(), 4);
        assert_eq!(payloads[0].usage, PayloadUsage::ClipStart { id: mesh_clip });
        assert_eq!(payloads[0].positions.len(), 3, "多边形顶点随 clip 交付");
        assert_eq!(payloads[1].usage, PayloadUsage::Mesh(mesh_mid));
        assert_eq!(payloads[2].usage, PayloadUsage::ClipEnd { id: mesh_clip });
        assert_eq!(payloads[3].usage, PayloadUsage::Mesh(mesh_end));
    }

    /// build_payloads 的 slot->deform 匹配：同一 slot 同网格多条 deform 时取第一条（与网格匹配的 deform 生效）
    /// mesh_a 无 bones（非加权网格），deform 为绝对位置，root 无变换 -> 顶点直接输出 deform 值
    #[test]
    fn render_frame_deform_map_first_wins() {
        let (mut rt, skin_idx, _) = build_rt();
        // 重建动画：同一 slot 两条 deform timeline（同网格 mesh_a），第一条 (5,7) 第二条 (9,9)
        let mut animates = AnimateSet::new();
        let anim_idx = animates.insert(
            "walk",
            AnimationRT {
                name: "walk".to_string(),
                constraint_timelines: vec![],
                deform_timelines: vec![
                    DeformTimeline {
                        slot: unsafe { SlotIdx::from_index(0) },
                        mesh: unsafe { MeshIdx::from_index(0) },
                        frames: vec![
                            DeformFrame {
                                time: 0.0,
                                vertices: vec![5.0, 7.0],
                                curve: Curve::Linear,
                            },
                            DeformFrame {
                                time: 1.0,
                                vertices: vec![9.0, 11.0],
                                curve: Curve::Linear,
                            },
                        ],
                    },
                    DeformTimeline {
                        slot: unsafe { SlotIdx::from_index(0) },
                        mesh: unsafe { MeshIdx::from_index(0) },
                        frames: vec![
                            DeformFrame {
                                time: 0.0,
                                vertices: vec![9.0, 9.0],
                                curve: Curve::Linear,
                            },
                            DeformFrame {
                                time: 1.0,
                                vertices: vec![1.0, 1.0],
                                curve: Curve::Linear,
                            },
                        ],
                    },
                ],
                draw_order_timeline: None,
                duration: 1.0,
                timelines: vec![],
                slot_timelines: vec![],
            },
        );
        rt.animates = animates;

        let mut config = AnimateConfig::new();
        // t=0：deform_map 命中第一条 deform -> 绝对位置 (5,7)
        let payloads = rt.render_frame(&[skin_idx], anim_idx, &mut config, 0.0);
        assert_eq!(payloads.len(), 1);
        assert!(
            (payloads[0].positions[0].x - 5.0).abs() < 1e-4
                && (payloads[0].positions[0].y - 7.0).abs() < 1e-4,
            "got {:?}",
            payloads[0].positions[0]
        );
        // t=0.5：两 timeline 帧间插值，仍取第一条（0.5*(5,7)+0.5*(9,11)=(7,9)）
        let payloads = rt.render_frame(&[skin_idx], anim_idx, &mut config, 0.5);
        assert!(
            (payloads[0].positions[0].x - 7.0).abs() < 1e-4
                && (payloads[0].positions[0].y - 9.0).abs() < 1e-4,
            "got {:?}",
            payloads[0].positions[0]
        );
    }

    /// deform 按 (slot, mesh) 匹配：不同 attachment 的 deform 只作用于各自网格，
    /// 不会把别的 attachment 的形变强加到当前显示的网格上（官方 timelineAttachment 语义）
    #[test]
    fn render_frame_deform_matches_mesh() {
        let (mut rt, skin_idx, _) = build_rt();
        // 重建动画：同一 slot 两条 deform timeline，分别挂 mesh_a / mesh_b
        let mut animates = AnimateSet::new();
        let anim_idx = animates.insert(
            "walk",
            AnimationRT {
                name: "walk".to_string(),
                constraint_timelines: vec![],
                deform_timelines: vec![
                    DeformTimeline {
                        slot: unsafe { SlotIdx::from_index(0) },
                        mesh: unsafe { MeshIdx::from_index(0) }, // mesh_a
                        frames: vec![DeformFrame {
                            time: 0.0,
                            vertices: vec![5.0, 7.0],
                            curve: Curve::Linear,
                        }],
                    },
                    DeformTimeline {
                        slot: unsafe { SlotIdx::from_index(0) },
                        mesh: unsafe { MeshIdx::from_index(1) }, // mesh_b
                        frames: vec![DeformFrame {
                            time: 0.0,
                            vertices: vec![30.0, 40.0],
                            curve: Curve::Linear,
                        }],
                    },
                ],
                draw_order_timeline: None,
                duration: 1.0,
                timelines: vec![],
                slot_timelines: vec![],
            },
        );
        rt.animates = animates;

        let mut config = AnimateConfig::new();
        // t=0：皮肤默认 attachment "a" -> mesh_a，应命中 mesh_a 的 deform (5,7)，而非 mesh_b 的 (30,40)
        let payloads = rt.render_frame(&[skin_idx], anim_idx, &mut config, 0.0);
        assert_eq!(payloads.len(), 1);
        assert!(
            (payloads[0].positions[0].x - 5.0).abs() < 1e-4
                && (payloads[0].positions[0].y - 7.0).abs() < 1e-4,
            "got {:?}",
            payloads[0].positions[0]
        );
    }
}